From the Department of Rheumatology, the Department of Radiology and Nuclear Medicine, and the Department of Respiratory Medicine, Oslo University Hospital, Rikshospitalet; Faculty of Medicine, Institute of Clinical Medicine, University of Oslo, Oslo; Department of Pediatrics, University Hospital of North Norway; Institute of Clinical Medicine, University of Tromsø, Tromsø; Department of Pediatrics, St. Olavs Hospital; Institute of Laboratory Medicine, Children’s and Women’s Health, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim,
Norway.

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